All Cunningham numbers (exponents less than 1200) have been tested for 50 bit factors. Consult this forum for exponents that may need even more ECM factoring. For maximum throughput, you should use GMP-ECM for stage 2.
P668 has a factor: 375283446486344365461807838534613233**
P679 has a factor: 209263101129304381417185794914874527112788657**
P697 has a factor: 995911976881150379710251245959795777578773753***
P704 has a factor: 3210843755324367119258027752661239735297**
P716 has a factor: 6249618890312649605712432659622854257
P727 has a factor: 59803996769241650545074361210286131**
P731 has a factor: 15797542906128411931089923981198031035849**
P739 has a factor: 33407751111787921302306812882603339179**
P761 has a factor: 1891134139996867428902217085790800258704289**
P796 has a factor: 8214796852906477415899530941807101361**
P824 has a factor: 38525979266360291610293571395929675314692801
P829 has a factor: 2751096190869286949881816932924433
P848 has a factor: 3408818505565834978224383921527937**
P863 has a factor: 1020169266060477773800580920702507013464523497**,***
P871 has a factor: 136202831651126186404748956578551589361900494227**
P876 has a factor: 241378644784282665724224215269676274193**
P877 has a factor: 18969179136276645172100272388219
P888 has a factor: 129887637532703885175569346500164339384596481**
P893 has a factor: 1513038588606647037924377544619001786660891**
P899 has a factor: 575087607870890436346963910799123377**
P928 has a factor: 4971141705173876156149290559555016352907777
P956 has a factor: 8806289643641483412983387861556412577
P973 has a factor: 1738265567571623156365340866047578896250851**
P983 has a factor: 450533013876830977899721147965761959561
P984 has a factor: 738313998235889565301599572531640626810525425999201**,***
P991 has a factor: 7785692962749707974896202971851600869561
P1033 has a factor: 12366664051937762461361289279871201655390521
P1051 has a factor: 234166918021181298229848923411137491270809
P1069 has a factor: 27793430506131075606692275603032027848987**
P1105 has a factor: 653182304411316461972398177939790632491565608971**
P1127 has a factor: 19322013444181029485042759893019522147
P1136 has a factor: 9168689293924594269435012699390053650369
P1137 has a factor: 36967896067692174895186731445885654925399550043
P1152 has a factor: 87706468640521797294901519524699649
P1172 has a factor: 91433799750097436823339479719705770866646653617
P1173 has a factor: 15477225584568935651447216741685456162338995027
P1195 has a factor: 1476292474364321072638637843510554375995931
** indicates factorization of the number is now complete.
*** indicates Paul Zimmermann's gmp-ecm used in stage 2.
Last updated: April 23, 2007